I'm replacing this carpet leading to my basement and my question is about cutting the new carpeting to avoid extra seams, waste etc. All the steps below the ones pictured are standard riser height and 36" wide. The angled steps are as long as 50" at the widest part. I plan to buy the new carpet off the roll from HD which will be 12' by whatever length I need. I'm not worried about carpeting the standard steps but for the angled part, should I buy a 50" wide strip or is there another way to cover them with a smaller piece but angling it in a certain way? Also, is there a type of blade I should use plus any other tools I might need?